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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fdc063fbff354b5214521b48cbbc4b37e2a1d4e34be1ca16c5970bf18392615' 
  AND token = 'Q71/pPSfy/g8i8cCWER1rQxs4o8Cybh5XkJoSoCL8Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}